We always capitalize the first and last names of a person.
Mary Jones
Bill Smith
We also capitalize a person’s title. Common titles are Mr. (mister); Mrs. (missus); Dr. (doctor); Rev. (reverend)
Mrs. Mary Jones
Mr. Bill Smith
Even though pets are not people, we capitalize their names too.
Rover
Fido
Kitty
Be sure to use capital letters to begin all names of people and pets.